A student was tasked to perform gravimetric analysis of a soluble sulfate. His unknown sample weighed 0.7543 g. The sample underwent precipitation using BaCl2 and was digested for overnight. The precipitate was then filtered off to obtain white crystalline precipitate that was collected in an ash less filter paper. In performing constant weighing, he obtained a crucible mass that is 29.9442 g. After burning his samples inside the crucible, the obtained mass was 30.3375 g.

Question

- What is the mass of BaSO4
- Compute for the % error of the student in his analysis.

Answer 1

30.3375 = mass xble + ppt
-29.9442 = mass xble
-----------------
00.3933 = mass ppt
You don't give any information on the % BaSO4 in the sample; therefore, we can't calculate a % error.

Answer 2

hmmm, here are the other question though.

Compute for the experimental mass (g) of SO3 in grams obtained by the student. my answer = 0.1349

Compute for the experimental % SO3 obtained by the student. my answer = 17.89

Compute for the theoretical % SO3 obtained by the student, my answer =17.89

Compute for the theoretical mass (g) of SO3 that should be obtained by the student using his weighed sample. my answer = 0.1134

then finally the Compute for the % error of the student in his analysis my answer is round about 47.86% but it is not in the choices given.

Answer 3

The answers to the additional questions are correct; however, I don't have any way to check the last two (shown below). I can't calculate theoretical mass if I don't know the correct % mass. Likewise, I can't calculate a % error if I don't know what it was supposed to be.

Compute for the theoretical mass (g) of SO3 that should be obtained by the student using his weighed sample. my answer = 0.1134

then finally the Compute for the % error of the student in his analysis my answer is round about 47.86% but it is not in the choices given.